I was on the way home tonight and had almost the exact same thing happen.
2019 Explorer Sport with just about 8000 miles on it. Was driving on the highway doing around 60-65 and suddenly felt some weird vibration, and then bang a couple jolts from transmission - and same thing all the lights for Terrain Management, Advanced Trac, Hill Descent - etc. all went off and I could no longer accelerate, just no power - luckily I was less than half a mile to my exit and no traffic, and managed to coast towards the exit keeping just enough power to make it off. Once I was off and slowed down, I would try to accelerate and it would barely go, and would never go above around 1500-2000 RPM's. Dammit. I limped it home the next mile. I can put it in reverse and a big thunk. Put it in Drive and another thunk, but same thing. I looked under didn't see any fluids, it was almost dark, and I tried getting under to see if there was any damage or if the PTU had exploded or something but couldn't see anything. I looked under the hood briefly any nothing out of the ordinary, barely any dust as it won't even be a year old for another few months.
I saw this thread describing almost exactly what happened to me, so I popped the hood again and took the engine cover off to take a look at the MAP sensor on the intake - at first glance, everything under the cover still looks pretty much immaculate save for some of the various black tape on things starting to fray - but damn if there wasn't a friggin loose part just laying there, that looks like its never even been connected! It doesn't even make sense - it appears to be some sort of Vent Assembly of some kind, still has the white tag part on Ford DG13-7034-EA. Basically a 9-10 inch long rubber hose about 1/2 inch wide with 1/4 inch inner width, with 3 bends and a cap on it labeled "Gore" and a. zip tie mounting clip, that looks like its never been attached to anything either. I am attaching a photo. It was laying partially on top of the intake just to the right of the top MAP sensor, and extending down a bit and towards the front laying partially over the three vacuum lines. It looks brand new, and like it was never attached to anything. I look all around and I can't for the life of me find any place that looks like its missing a hose like that or anywhere it would connect. Where it was positioned under the engine cover, it seems impossible for it to have just suddenly come off, or been blown under there somehow, since the 3 clip points for the engine cover were securely in place. I literally have no clue where its supposed to go, and what sort of "Vent Assembly" it is or used for. Transmission? Something else? Bottom line though, I never saw this before. I've had an oil change - but that was several months ago in September - and haven't had any engine or transmission problems at all. (Don't get me started on the GPS, Sync3 or the damn useless roof-rack rails popping off constantly). And the map sensor on the intake looked fine when I took it off, no corrosion or dirt/gunk - but didn't have a good way to test it. (Is there any easy way to test a MAP sensor?)
Anyone have any clue from photos below as to what that specific part is (label DG13-7034-EA) and where the heck it should actually go? Or is this just a bonus leftover from the factory? Am really hoping it wasn't some critical part that may have been the cause for this sudden failure tonight. And would that make sense given whatever this is, if its been unattached all this time to relate to what happened, issues I just had occur? Thanks for any feedback!
Looks like I'll be getting a tow to the dealer in the morning - of course this happened just after 6pm so I couldn't even make an appointment - and trying to get a loaner.... what a nightmare... Forgot to add, that the reason I ended up with this 2019 Sport, was I had a 2014 Limited, that had the PTU grenade itself at 43K (before I was a aware of the well documented issues) - I didn't want to pour money into purchasing another extended service warranty, when the PTU could just fail again, so I traded it in for this 2019 Sport - hoping some things would be solved... what a disappointment so far. Ford has some serious quality control and design issues...
UPDATED: Did some more searching after posting this earlier, and it looks like the part in question is PTU Vent Hose - dammit. I'll have to check in the morning to see if there is one attached - and maybe I'm lucky and its just a MAP sensor, or if this has been like this from factory/dealer since I purchased and caused the failures! There is no hose clamp on it or even marks where it would have been clamped/tightened down - unless this just pushes on to a nipple of some sort... I have to believe this is a screw up from the factory, especially given the location where I found it - and the label with the part number, etc. still attached, and its pristine condition. Astounded at the poor level of fit/finish, attention to details - and so angry I never noticed this before when I originally took delivery - and all the problems I had with the PTU on my previous 2014 Limited. So disgusted right now...
Mystery part #DG13-7-34-EA (PTU Vent hose?)
Approximately where I found it laying after taking engine cover off: